/*
 * Copyright (c) 2001-2008 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */

package io.joyrpc.com.caucho.hessian.io;

import io.joyrpc.com.caucho.hessian.HessianException;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Serializing a Java annotation
 */
public class AnnotationSerializer extends AbstractSerializer {
    private static final Logger log
            = Logger.getLogger(AnnotationSerializer.class.getName());

    private static Object[] NULL_ARGS = new Object[0];

    private Class _annType;
    private Method[] _methods;
    private MethodSerializer[] _methodSerializers;

    public AnnotationSerializer(Class annType) {
        if (!Annotation.class.isAssignableFrom(annType)) {
            throw new IllegalStateException(annType.getName() + " is invalid because it is not a java.lang.annotation.Annotation");
        }
    }

    public void writeObject(Object obj, AbstractHessianOutput out) throws IOException {
        if (out.addRef(obj)) {
            return;
        }

        init(((Annotation) obj).annotationType());

        int ref = out.writeObjectBegin(_annType.getName());

        if (ref < -1) {
            writeObject10(obj, out);
        } else {
            if (ref == -1) {
                writeDefinition20(out);
                out.writeObjectBegin(_annType.getName());
            }

            writeInstance(obj, out);
        }
    }

    protected void writeObject10(Object obj, AbstractHessianOutput out) throws IOException {
        for (int i = 0; i < _methods.length; i++) {
            Method method = _methods[i];

            out.writeString(method.getName());

            _methodSerializers[i].serialize(out, obj, method);
        }

        out.writeMapEnd();
    }

    private void writeDefinition20(AbstractHessianOutput out) throws IOException {
        out.writeClassFieldLength(_methods.length);

        for (int i = 0; i < _methods.length; i++) {
            Method method = _methods[i];

            out.writeString(method.getName());
        }
    }

    public void writeInstance(Object obj, AbstractHessianOutput out) throws IOException {
        for (int i = 0; i < _methods.length; i++) {
            Method method = _methods[i];

            _methodSerializers[i].serialize(out, obj, method);
        }
    }


    private void init(Class cl) {
        synchronized (this) {
            if (_annType != null) {
                return;
            }

            _annType = cl;

            ArrayList methods = new ArrayList();

            for (Method method : _annType.getDeclaredMethods()) {
                if (method.getName().equals("hashCode")
                        || method.getName().equals("toString")
                        || method.getName().equals("annotationType")) {
                    continue;
                }

                if (method.getParameterTypes().length != 0) {
                    continue;
                }

                methods.add(method);

                method.setAccessible(true);
            }

            if (_annType == null) {
                throw new IllegalStateException(cl.getName() + " is invalid because it does not have a valid annotationType()");
            }

            _methods = new Method[methods.size()];
            methods.toArray(_methods);

            _methodSerializers = new MethodSerializer[_methods.length];

            for (int i = 0; i < _methods.length; i++) {
                _methodSerializers[i] = getMethodSerializer(_methods[i].getReturnType());
            }
        }
    }

    private Class getAnnotationType(Class cl) {
        if (cl == null) {
            return null;
        }

        if (Annotation.class.equals(cl.getSuperclass())) {
            return cl;
        }

        Class ifaces[] = cl.getInterfaces();

        if (ifaces != null) {
            for (Class iface : ifaces) {
                if (iface.equals(Annotation.class)) {
                    return cl;
                }

                Class annType = getAnnotationType(iface);

                if (annType != null) {
                    return annType;
                }
            }
        }

        return getAnnotationType(cl.getSuperclass());
    }

    private static MethodSerializer getMethodSerializer(Class type) {
        if (int.class.equals(type)
                || byte.class.equals(type)
                || short.class.equals(type)
                || int.class.equals(type)) {
            return IntMethodSerializer.SER;
        } else if (long.class.equals(type)) {
            return LongMethodSerializer.SER;
        } else if (double.class.equals(type) ||
                float.class.equals(type)) {
            return DoubleMethodSerializer.SER;
        } else if (boolean.class.equals(type)) {
            return BooleanMethodSerializer.SER;
        } else if (String.class.equals(type)) {
            return StringMethodSerializer.SER;
        } else if (java.util.Date.class.equals(type)
                || java.sql.Date.class.equals(type)
                || java.sql.Timestamp.class.equals(type)
                || java.sql.Time.class.equals(type)) {
            return DateMethodSerializer.SER;
        } else {
            return MethodSerializer.SER;
        }
    }

    static HessianException error(Method method, Throwable cause) {
        String msg = (method.getDeclaringClass().getSimpleName()
                + "." + method.getName() + "(): " + cause);

        throw new HessianMethodSerializationException(msg, cause);
    }

    static class MethodSerializer {
        static final MethodSerializer SER = new MethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            Object value = null;

            try {
                value = method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            try {
                out.writeObject(value);
            } catch (Exception e) {
                throw error(method, e);
            }
        }
    }

    static class BooleanMethodSerializer extends MethodSerializer {
        static final MethodSerializer SER = new BooleanMethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            boolean value = false;

            try {
                value = (Boolean) method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            out.writeBoolean(value);
        }
    }

    static class IntMethodSerializer extends MethodSerializer {
        static final MethodSerializer SER = new IntMethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            int value = 0;

            try {
                value = (Integer) method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            out.writeInt(value);
        }
    }

    static class LongMethodSerializer extends MethodSerializer {
        static final MethodSerializer SER = new LongMethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            long value = 0;

            try {
                value = (Long) method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            out.writeLong(value);
        }
    }

    static class DoubleMethodSerializer extends MethodSerializer {
        static final MethodSerializer SER = new DoubleMethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            double value = 0;

            try {
                value = (Double) method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            out.writeDouble(value);
        }
    }

    static class StringMethodSerializer extends MethodSerializer {
        static final MethodSerializer SER = new StringMethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            String value = null;

            try {
                value = (String) method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            out.writeString(value);
        }
    }

    static class DateMethodSerializer extends MethodSerializer {
        static final MethodSerializer SER = new DateMethodSerializer();

        void serialize(AbstractHessianOutput out, Object obj, Method method) throws IOException {
            java.util.Date value = null;

            try {
                value = (java.util.Date) method.invoke(obj);
            } catch (InvocationTargetException e) {
                throw error(method, e.getCause());
            } catch (IllegalAccessException e) {
                log.log(Level.FINE, e.toString(), e);
            }

            if (value == null) {
                out.writeNull();
            } else {
                out.writeUTCDate(value.getTime());
            }
        }
    }
}
